pyrox.dev
1{ lib
2# we pass the kernel version here to keep a nice syntax `whenOlder "4.13"`
3# kernelVersion, e.g., config.boot.kernelPackages.version
4, version
5, mkValuePreprocess ? null
6}:
7
8with lib;
9rec {
10 # Common patterns
11 when = cond: opt: if cond then opt else null;
12 whenAtLeast = ver: when (versionAtLeast version ver);
13 whenOlder = ver: when (versionOlder version ver);
14 whenBetween = verLow: verHigh: when (versionAtLeast version verLow && versionOlder version verHigh);
15
16 # Keeping these around in case we decide to change this horrible implementation :)
17 option = x: if x == null then null else "?${x}";
18 yes = "y";
19 no = "n";
20 module = "m";
21
22 mkValue = val:
23 let
24 isNumber = c: elem c ["0" "1" "2" "3" "4" "5" "6" "7" "8" "9"];
25 in
26 if val == "" then "\"\""
27 else if val == yes || val == module || val == no then val
28 else if all isNumber (stringToCharacters val) then val
29 else if substring 0 2 val == "0x" then val
30 else val; # FIXME: fix quoting one day
31
32
33 # generate nix intermediate kernel config file of the form
34 #
35 # VIRTIO_MMIO m
36 # VIRTIO_BLK y
37 # VIRTIO_CONSOLE n
38 # NET_9P_VIRTIO? y
39 #
40 # Use mkValuePreprocess to preprocess option values, aka mark 'modules' as
41 # 'yes' or vice-versa
42 # Borrowed from copumpkin https://github.com/NixOS/nixpkgs/pull/12158
43 # returns a string, expr should be an attribute set
44 generateNixKConf = exprs: mkValuePreprocess:
45 let
46 mkConfigLine = key: rawval:
47 let
48 val = if builtins.isFunction mkValuePreprocess then mkValuePreprocess rawval else rawval;
49 in
50 if val == null
51 then ""
52 else if hasPrefix "?" val
53 then "${key}? ${mkValue (removePrefix "?" val)}\n"
54 else "${key} ${mkValue val}\n";
55 mkConf = cfg: concatStrings (mapAttrsToList mkConfigLine cfg);
56 in mkConf exprs;
57}